DIY KIT DDS AD9910 Arduino Shield RF Signal Generator NO ARDUINO Low noise spurs

Description

DIY KIT for DDS AD9910 Arduino Shield Signal Generator
sine wave 420Mhz @1GSPS Low Spurs Low
Harmonic,
u
p to sine wave output 600Mhz
@1.5GSPS
overclock,
Attention needs a forced cooling
DDS AD9910 Arduino Shield RF Signal Generator
DDS (Direct Digital Synthesis) Analog Devices AD9910 Arduino Shield by GRA & AFCH
Easy connection to Arduino MEGA 2560 without additional wires and converters
All functions of the DDS AD9910 are brought to the contacts of the Arduino MEGA
With this you can fully reveal all the capabilities of the DDS AD9910 Shield
Opensource Software available on our GitHub repository:
afch/DDS-AD9910-Arduino-Shield
Video review on our YouTube channel:
youtu.be/_MUsmr0cAD4
Listing includes:
AD9910 Shield Board (Bare PCB)
Set of Parts and Components (Electronics, Screws, Nuts, Spacers)
OLED Display (
included
)
Clock Chip (
included
, TCXO 1ppm)
BOM List of Parts and Components for DIY KIT
We recommend to use RF Amplifier with our DDS Shield Boards
(RF Amplifier 8-2000 MHz, GAIN = 20 dB, P = +20 dBm MMIC MRFA89 SOT-89):
https://www.ebay.com/itm/184629327037
Key Benefits:
Low harmonics no more than -60dBc. An output RF transformer is used for the correct operation of the current mirror.
Small spurs.
4 layer board. Signal lines TOP and Bottom, inner layers Ground and Power.
Low Noise LDO Stabilizers.
Separate power supply for all analog and digital lines (1.8V and 3.3V), 5 pcs IC voltage stabilizers are used. Additionally, there is an RF Ferrite bead interchange.
High-speed decoupling Level converter and TTL 5V matching.
Types of possible reference oscillators (choose one of them in the selector):
XO – Crystal 25 MHz 20 ppm internal oscillator with PLL at 1 GHz.
TCXO – 10 MHz 1 ppm external oscillator PLL at 1 GHz.
EGEN – external generator up to 1.5 GHz. (To connect an external clock source of up to 1.5 GHz, this source is NOT INCLUDED).
OCXO – Oven Controlled Crystal Oscillators deliver the ultimate piezo electric performance with stabilities down to less than ±1 ppm.
Additionally balancing transformer is used for TCXO, EGEN and OCXO options:
Easy to connect OLED display.
Control buttons for control via the program menu.
The synthesizer is capable to generate sine wave, AM or FM modulated signal.
The software allows you to select and configure the frequency of the clock generator through the user menu (without the need to recompile the program).
Any settings can be stored in non-volatile EEPROM memory (located at Arduino Mega).
Basic settings are applied and saved automatically.
This shield support overclocking the AD9910 core to 1.5 GHz (
heatsink is recommended
).
DDS AD9910 Shield has ability to generate a signal up to 600 MHz with a core overclocking up to 1.5 GHz,
(to suppress harmonics, it is recommended to overclock the AD9910 for frequencies above 400 MHz).
Has ability to increase output power by +4 dBm when “DAC Current HI” is activated.
Phase Noise
This parameter is very important and interesting for those who buy DDS.
Since the intrinsic phase noise of DDS is obviously less than that of PLL generators, the final value is highly dependent on the clock source.
In order to achieve the values stated in the datasheet for AD9910, we strictly adhered to all recommendations from Analog Devices.
When designing our DDS AD9910 Arduino Shield we have followed these requirements:
PCB layout in 4 layers, separate power supply of all 4 power lines (3.3 V digital, 3.3 V analog, 1.8 V digital, and 1.8 V analog).
Therefore, when buying our DDS AD9910 Arduino Shield, you can focus on the data from the datasheet on the AD9910.
Figure 16 shows the noise level when using the built-in PLL in DDS. The PLL multiplies the frequency of a 50 MHz generator by 20 times.
We use a similar frequency – 40 MHz (x25 Multiplier) or 50 MHz (x20 Multiplier) from TCXO which gives even more stability.
Figure 15 shows the noise level when using an external reference clock 1 GHz, with the PLL off.
DDS AD9910 Arduino Shield Phase Noise
DDS AD9910 Arduino Shield Phase Noise
Comparing these two plots, for example, for Fout = 201.1 MHz and the internal PLL turned on at 10 kHz carrier offset, the phase noise level is -130 dBc @ 10 kHz.
And with the PLL off and using external clocking, the phase noise is 145 dBc @ 10kHz.
That is, when using an external clock phase noise by 15 dBc better (lower).
For the same frequency Fout = 201.1 MHz, and the internal PLL turned on at 1 MHz carrier offset, the phase noise level is -124 dBc @ 1 MHz.
And with the PLL off and using external clocking, the phase noise is 158 dBc @ 1 MHz.
That is, when using an external clock phase noise by 34 dBc better (lower).
Conclusion: when using external clocking, you can get much lower phase noise than using the built-in PLL.
But do not forget that in order to achieve such results, increased requirements are put forward to the external generator.
OLED Display Menus:
DDS AD9910 Main Menu
DDS AD9910 Core Clock Menu
DDS AD9910 AM Modulation Menu
DDS AD9910 FM Modulation Menu
Dear Customers!
If you have ANY questions, PLEASE ASK US
Specifications:
Frequency:
100 kHz - 420 MHz (600 MHz*) in 1 Hz step
Spurs max:
-60 dBc
Frequency step:
1 Hz
Output power:
+0 dBm (+4**) to -84 dBm (on 50 Ohm load)
Output level up to:
1 Vpeak-to-peak (at +4 dBm)
Power Supply:
USB or External Power Supply 7V DC 1A
Output filter:
7-th order
Modulation frequency for AM (amplitude modulation):
10 Hz to 100 kHz in 1 Hz step
AM modulation depth:
0% to 100% in 1% increments
Modulation Frequency for FM (Frequency Modulation):
10 Hz to 100 kHz in 1 Hz step
FM modulation deviation frequency:
0 Hz to 100 kHz in 1 Hz step
Reference clock sources (on choice):
XO-Crystal Oscillator, TCXO 1ppm, OCXO 0.1ppm, Crystek, or External Oscillator up to 1.5 Ghz
Size:
53.26 x 102mm
* When overclocking the core to 1.5 GHz
** When the "DAC Current HI" function is activated
DDS AD9910 Arduino Shield References:
AD9910 Shield Board Top Bare PCB:
AD9910 Shield Board Bottom Bare PCB:
AD9910 Shield Board Top Populated PCB:
AD9910 Shield Board Bottom Populated PCB:
DIY KIT for DDS AD9910 Shield:
DDS AD9910 Arduino Shield Spectrograms:
GRA & AFCH DDS AD9910 Shield VS DDS Board from China Spectrograms Comparison:
Spectrum Analyzer Screenshots (200 MHz)
Spectrum Analyzer Screenshots (350 MHz)
Spectrum Analyzer Screenshots (100 MHz)
Spectrum Analyzer Screenshots (10 MHz)
GRA & AFCH DDS AD9910 Shield Spectrograms:
500 MHz, DAC Current set to “HI”
600 MHz, DAC Current set to “HI”
AM (Amplitude Modulation) Modulation Freq: 1kHz, Depth: 50%
FM (Frequency Modulation) Frequency: 1 kHz Deviation: 3 kHz
AM (Amplitude Modulation) Carrier: 1 MHz Frequency: 100 kHz Depth: 50%
DDS AD9910 Arduino Shield Thermal images:
AD9910 Board temperature measured with Flir E8 thermal imager at
Core Clock @
1000 MHz
AD9910 Board temperature measured with Flir E8 thermal imager at
Core Clock @
1440 MHz
Arduino MEGA to Shield AD9910 Pinout Scheme:
DDS Arduino Shield AD9910 RF Signal Generator Overview:
Please refer to full video Overview of our DDS AD9910 Shield RF Signal Generator on our YouTube channel: 'GRA & AFCH'
DDS Arduino Shield AD9910 RF Signal Generator:
Dear Customers!
If you have ANY questions, PLEASE ASK US
Shipping and Return Information
All Items are Shipped from Ukraine
Via International registered Airmail
Shipments made within 1 business day
After Payments received and verified
It takes about 2-5 days via UPS Express
And 15-35 days via Economy Shipping
We combine multiple items to save on Shipping
UPS Express Shipping time (recommended):
Europe:
2-4 days
Germany:
2-4 days
USA, Canada:
3-5 days
Asia, South America:
3-5 days
Australia, New Zeland:
3-5 days
Africa, Central America:
3-5 days
Economy Shipping time:
Europe:
15-12 days
Germany:
15-18 days
USA, Canada:
18-35 days
Asia, South America:
18-35 days
Australia, New Zeland:
20-35 days
Africa, Central America:
23-35 days
Return Policy
All Returns are accepted
For Return you should contact Us within 14 Days after receiving the Item
Refunds are made as Money back or Replacements (buyer’s choice)
Return Shippings are paid by the buyer
No restocking fees are charged
Dear Customers!
If you have ANY questions, PLEASE ASK US